Science 8 · Unit 6: Light · Cambridge Lower Secondary Science Stage 8

Questions

1. 1. Which means the same as 'plane mirror'?

   • flat mirror
   • curved mirror
   • bathroom mirror
   • magnifying mirror
   Check

2. 2. Which movement of a ball is an analogy for reflection of light?

   • bouncing
   • stopping
   • speeding up
   • slowing down
   Check

3. 3. What is the ray arriving at a mirror called?

   • the incident ray
   • the normal
   • the reflected ray
   • the refracted ray
   Check

4. 4. What is the line at 90° to the mirror called?

   • the reflected ray
   • the mirror line
   • the normal
   • the incident ray
   Check

5. 5. What is the law of reflection?

   • Angles are measured from the mirror surface only.
   • The reflected ray always goes straight back.
   • The angle of incidence equals the angle of reflection.
   • The angle of incidence is double the angle of reflection.
   Check

6. 6. From where are the angles of incidence and reflection measured?

   • from the normal
   • from the floor
   • from the mirror surface
   • from the light source
   Check

7. 7. A ray has an angle of incidence of 35°. What is the angle of reflection?

   • 55°
   • 70°
   • 35°
   • 145°
   Check

8. 8. A ray makes an angle of 60° with the mirror surface. What is the angle of incidence?

   • 90°
   • 60°
   • 30°
   • 120°
   Check

9. 9. A ray hits a mirror along the normal (angle of incidence 0°). Where does it go?

   • along the mirror
   • it is absorbed
   • at 90° to the side
   • straight back along the same path
   Check

10. 10. Which instrument is used to measure angles in ray diagrams?

    • a protractor
    • a forcemeter
    • a ruler only
    • a thermometer
    Check

11. 11. Light reflects off two mirrors. If the first angle of reflection is 45°, what is the first angle of incidence?

    • 45°
    • 135°
    • 90°
    • 22.5°
    Check

12. 12. Why do you see your reflection in a mirror but not in a wall?

    • Mirrors make light.
    • Walls absorb all light.
    • A mirror is smooth and reflects light regularly.
    • Walls are transparent.
    Check

13. 13. What do the arrows on light rays in a ray diagram show?

    • the colour of the light
    • the brightness
    • the speed only
    • the direction the light travels
    Check

14. 14. In a periscope, through what angle does each mirror turn the light?

    • 30°
    • 45°
    • 180°
    • 90°
    Check

15. 15. A car driver sees a cyclist behind by using a mirror. Where does the light reflected by the mirror go?

    • into the driver's eye
    • along the mirror's surface
    • into the Sun
    • back to the cyclist
    Check